It really depends on what you plan to guard. Some people believe that one dog’s bark is not as effective at scaring someone away as another dog’s bite. For this reason, some people may prefer dogs that are more aggressive than others. They simply need to evaluate the situation and act accordingly based on what they want to be protected. One thing to look for though is breed disposition towards humans if guarding against intruders might put the well-being of the Rottweiler in danger…